Anthony Tseng 1648d05675 Extract PDF content from browser process (#21570) ...

* Extract PDF content from browser process

Since a11y tree info is guaranteed to be synced between renderer and
browser, we toggle on basic a11y mode for PDF process when embedded
pdf webcontents is attached to main one. And then we wait for "Finished
loading PDF" event so we can fetch PDF content from browser a11y tree.

* Enforce enable_pdf guard for IDS_PDF_LOADED_TO_A11Y_TREE

* Rebase onto PR #21408

* Wait for OnPDFA11yInfoLoaded before proceeding FetchPageContent for PDF content

2024-01-19 15:24:47 -05:00

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